Cloud Ready Design through Application Software Infrastructure
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The document discusses building enterprise software with a 'cloud ready' design using an application infrastructure. It advocates separating the core application from frameworks through modularity, abstraction, and encapsulation. This allows the application to be deployed both on-premises and to the cloud in a gradual, non-disruptive manner. The application infrastructure enforces this architecture, providing features like dependency injection, isolation of data access concerns, and logging abstractions to manage complexity and scale across environments.
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Cloud Ready Design through Application Software Infrastructure
- 1. ‘Cloud Ready’ Design through Application Software Infrastructure Florin Coros
- 2. About me Co-Founder @florincoros Partner & Co-Founder blog.iquarc.com/florin
- 3. Outdated Enterprise Software 3 Enterprise Software Old Technologies Costly to maintain and update
- 4. Re-Implement on a Modern Architecture Legacy System • High costs to update • Shetty UX • Outdated functionalities • Not scalable, not reliable Modern System • Accessible everywhere • Actual technologies • Good maintainability 4
- 5. On-Premise or Cloud or Both? 5
- 6. Build and Operate for On-Premises Deployable in Azure Enable a gradual migration into the Cloud Cloud migration does not require a rewrite or reengineering First phase use IaaS Second phase use PaaS Quality Isolation Separation Build, Test and Deploy for On-Premises only Large and Complex System Deployable on Azure Use PaaS 6
- 7. Source code dependencies can only point inwards • Nothing in an inner circle can know anything at all about something in an outer circle • Abstractions and application concepts are independent of frameworks • frameworks are used as tools, not to cram the system into their limiting constraints 7 http://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html Separate the core of the app from the frameworks and the mechanisms
- 8. What did we already do? 8 Design Envision solutions Setup rules and practices Managing Complexity Quality Change Separations Abstraction & Encapsulation Explain & Validate Diagrams Prototypes
- 9. Importance of Managing Complexity when projects do fail for reasons that are primarily technical, the reason is often uncontrolled complexity 9
- 10. Importance of Managing Complexity Scalability Availability Multitenancy Security Authorization
- 11. App Infrastructure Enforces the Architecture
- 15. Different Solutions to the Same Problem
- 16. Which one is the ONE?
- 17. App Infrastructure – Primary TOOL to Control Complexity and Size
- 18. How to do it? Invest in Design and App. Infrastructure Enforce consistency Enforce structure Focus on Modularity, Abstraction, Encapsulation Independent Modules Hide the frameworks Manage Dependencies Dependency Injection Discoverability 18
- 19. Good Design vs Bad Design http://martinfowler.com/bliki/DesignStaminaHypothesis.html
- 20. iQuarc AppBoot Library Lightweight library that handles the startup of an application Implements Separation of Construction and Configuration from Use Modularity Defines and abstracts a modular application Makes the application independent of the host process Dependencies Management Dependency Injection Enforces consistency in declaring dependencies Encourages good practices Encourages separation between data and behavior 20
- 21. iQuarc AppBoot: Modularity <<Interface>> IModule + Initialize() Application + Initialize() * + Modules[] AppModule1 + Initialize() AppModule2 + Initialize() • Modular Application Support • Application modules do not depend on Frameworks • Application can be hosted in any .NET process iQuarcAppBoot
- 22. Application Hosted in Any .NET Process • The application is not aware of the process it is hosted in • The application is isolated from framework specifics • The host process is not aware of what modules it hosts • The host process is isolated from application logic • Benefits: • Flexible deployments o same host can load different modules depending on configuration o Flexibility in development and testing • Framework setup is separated from application setup 22 <<Attribute>> ServiceAttribute + ServiceAttribute() +ServiceAttribute(Type contract) + ServiceAttribute(Type t, Lifetime lifetime) Bootstrapper +Bootstrapper(Assembly[] assemblies) +Run() Application + Initialize() iQuarcAppBoot
- 23. App Boot: Dependency Injection <<Attribute>> ServiceAttribute + ServiceAttribute() +ServiceAttribute(Type contract) + ServiceAttribute(Type t, Lifetime lifetime) Bootstrapper +Bootstrapper(Assembly[] assemblies) +Run() • Makes Programming Against Interfaces the de facto programming model • Abstracts and hides the Dependency Container • Provides a maintainable mechanism for declaring services implementation • Dictates how Dependency Injection is used iQuarcAppBoot
- 24. public IEnumerable<Policy> GetPolicyFromMutation(Mutation mut) { var policies = repository.GetEntities<PolicyImage>() .Where(image => image.MutationId==mut.Id) .Select(image => new Policy { Id = image.PolicyId, ValidAt = image.Mutation.Date //.. }).ToList(); // do other calculations / grouping on data return policies; } public void CalculateChanges(ChangeEvent change) { using (var uof = repository.CreateUnitOfWork()) { var policies = uof.GetEntities<PolicyImage>() .Where(i => i.Status == ImageStatus.Calculating && . i.EvendId == change.Id); foreach (PolicyImage image in policies) { image.Ammunt = GetAmmountFor(image, change); } uof.SaveChanges(); } } Encapsulate Data Access Concerns <<Interface>> IRepository +GetEntities<T>() : IQueriable<T> <<Interface>> IUnitOfWork +SaveChanges() Database Repository UnitOfWork <<Stereotype>> <<DTO>> Plan <<DTO>> Contract +CreateUnitOfWork() +GetEntities<T>():IQueriable<T> iQuarcDataAccess
- 25. Isolate from external libraries <<static class>> Log +LogError() +LogWarining() Exception Wrappers Decorators <<Interface>> API Interfaces 25
- 26. Application Infrastructure – Shaping to Context .NET Framework WF WCF WEB API ASP.NET Entity Framework . . . Unity NServiceBus Log4Net . . . Application Infrastructure Application Functionalities
- 27. When to do it? cumulativefunctionality time completion construction ready design payoff
- 28. When to do it?cumulativefunctionality time completion construction ready design payoff time Arc Arc Infra FunctionalityInfra FunctionalityInfra Functionality Functionality Functionality Functionality RepositoryImpl + GetEntities<T>() : IQueriable() IRepository IUnitOfWork + SaveChanges() IModule <<Attribute>> ServiceAttribute iQuarc Functionality
- 29. Thank You! Florin Coros Partner and Co-founder, iQuarc florin.coros@iquarc.com blog.iquarc.com/florin @florincoros